My grandma was very wealthy. She wore tweeds to death. If she'd still been alive she'd have looked down on people showing off their wealth with clothing and accessories.
It wasn't the norm, that's a myth. Child birth is dangerous, having children that young was even more dangerous. Children of rich families were married off young for political reasons, but even they waited with having children until they were older.
Why is actual socialism talking about communism, which isn't actual socialism?